📊 Intermediate Progress
Completed: % | Next Level: Advanced PHP
1. 📚 Functions and Variable Scope
🎯 Learning Objectives:
- ✓
📖 Deep Dive:
💡 Pro Tip: Functions help you write DRY (Don't Repeat Yourself) code. Always consider scope when using variables inside functions!
💻 Advanced Function Example:
\$counter,
'static' => \$staticCount
];
}
// Closure with use keyword
\$multiplier = 3;
\$multiply = function(\$num) use (\$multiplier) {
return \$num * \$multiplier;
};
// Recursive function
function factorial(\$n) {
if (\$n <= 1) return 1;
return \$n * factorial(\$n - 1);
}
// Test the functions
echo 'First call: ' . print_r(incrementCounter(), true);
echo 'Second call: ' . print_r(incrementCounter(), true);
echo 'Multiply 5 by 3: ' . \$multiply(5);
echo 'Factorial of 5: ' . factorial(5);
?>"); ?>
2. 📝 Form Handling & Validation
🎯 Learning Objectives:
- ✓
🎮 Interactive Form Playground
Try submitting this form to see PHP form handling in action!
📨 Last Form Submission:
💻 Server-side Validation Code:
500) {
\$errors[] = 'Message must be 10-500 characters';
}
if (empty(\$errors)) {
// Process valid data
echo 'Form submitted successfully!';
} else {
// Display errors
foreach (\$errors as \$error) {
echo '' . \$error . '
';
}
}
}
?>"); ?>
3. 🍪 Sessions & Cookies Management
Session Data
Times you've visited this page
Cookie Data
Your saved preference
Last Activity
Update on each page load
💻 Session & Cookie Code:
"); ?>
🎮 Database Query Challenge
Write SQL queries to interact with the simulated database!
📋 users
1 | John | john@email.com
2 | Jane | jane@email.com
3 | Bob | bob@email.com
4 | Alice | alice@email.com
5 | Charlie | charlie@email.com
📋 products
1 | Laptop | 999.99
2 | Mouse | 29.99
3 | Keyboard | 79.99
4 | Monitor | 299.99
5 | Headphones | 149.99
📋 orders
1 | 1 | 2024-01-15
2 | 2 | 2024-01-16
3 | 3 | 2024-01-17
4 | 1 | 2024-01-18
5 | 4 | 2024-01-19
Query result will appear here...
📁 File Upload & Handling
📂
Drop files here or click to upload
Supports: .txt, .php, .html, .css, .js (max 2MB)
💻 PHP File Upload Code:
2000000) {
echo 'File too large!';
exit;
}
// Allow certain file types
\$allowedTypes = ['txt', 'php', 'html', 'css', 'js'];
if (!in_array(\$fileType, \$allowedTypes)) {
echo 'File type not allowed!';
exit;
}
// Upload file
if (move_uploaded_file(\$_FILES['file']['tmp_name'], \$targetFile)) {
echo 'File uploaded successfully!';
} else {
echo 'Upload failed!';
}
}
?>"); ?>
📝 Intermediate Level Quiz
Test your intermediate PHP knowledge!
'What is the correct way to declare a static variable inside a function?',
'options' => ['static $var;', 'STATIC $var;', '$static var;', 'var static $var;'],
'correct' => 0
],
[
'question' => 'Which superglobal is used to access session variables?',
'options' => ['$_SESSION', '$_COOKIE', '$_SERVER', '$_ENV'],
'correct' => 0
],
[
'question' => 'What does PDO stand for?',
'options' => ['PHP Data Objects', 'Personal Database Option', 'Primary Data Output', 'PHP Database Operator'],
'correct' => 0
],
[
'question' => 'Which function is used to sanitize user input for database queries?',
'options' => ['mysqli_real_escape_string()', 'htmlspecialchars()', 'strip_tags()', 'trim()'],
'correct' => 0
],
[
'question' => 'How do you set a cookie that expires in 1 hour?',
'options' => ['setcookie("name", "value", time()+3600)', 'setcookie("name", "value", 3600)', 'cookie("name", "value", time()+3600)', 'create_cookie("name", "value", 3600)'],
'correct' => 0
]
];
$randomIndex = array_rand($questions);
$currentQuestion = $questions[$randomIndex];
?>
⚡ Code Challenge: Build a Login System
Using sessions and form handling, create a simple login system!
Requirements:
- Create a login form with username and password
- Validate inputs (username: 3-20 chars, password: min 6 chars)
- Store login status in session
- Create a logout button
- Show different content for logged-in users
💡 Starter Code: Check the example below for hints!
Logout'; } // Handle logout if (isset(\$_GET['logout'])) { session_destroy(); header('Location: ' . \$_SERVER['PHP_SELF']); exit; } ?>"); ?>
📥 Intermediate Resources
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